BY Reuben Rudman
Feb 15, 1971
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Influential Citations
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Journal
Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
Abstract
The crystal and molecular structure of tetrachlorophthalic anhydride (TCPA) was determined by single-crystal X-ray diffraction methods. It crystallizes in space group P21/n, a= 13"37 (2), b= 5.760 (8), c = 12.32 (2) A, fl = 91"03 (10) ° with four molecules per unit cell. Molecular overcrowding causes the chlorine atoms to be distorted 1.0 to 2.6 ° from the benzene ring plane. The average carbon--chlorine bond distance is 1.709 /~. It is suggested that, in aromatic compounds, the C-C1 bond distance is significantly shorter for two ortho bonds than for meta, para or isolated bonds.